... , high efficiency, pollution-free, . Construction: Aluminum Alloy. Solar panel: mono-crystalline silicon or polysilicon Battery: rechargeable, nickel- ... Effective Optical Distance: 50 metersFeature: White light beam. Environmentally friendly, solar flashlight is a patented product, which can be use for 5 ... the latest light source is adopted, ultra bright LED, imported solar cells, and long life.